Cathode ray tube base

Abstract

A base for a cathode ray tube includes at least one tube pin isolating means formed within the rim of the base to provide arc prevention between adjacent tube pins which can have up to a 12 KV potential difference therebetween. The isolating means comprises a cutout portion in the rim and an electrically insulating plug to fit therein.

What is claimed is: 
     
       1. In combination with a cathode ray tube, a base therefor, said cathode ray tube having a cylindrical terminal portion closed by a substantially planar wall provided with a plurality of annularly spaced, projecting tube pins each surrounded by a raised nubbin with a diameter larger than said pins where said pins exit from said wall, said base comprising a flat, circular rim having a diameter substantially equal to that of said cylindrical terminal portion; a plurality of tube pin receiving apertures extending through said rim for engaging said tube pins, said apertures being spaced inwardly from the outer circumference of said rim; and at least one tube pin isolating means formed within said flat circular rim, said tube pin isolating means including a cut-out portion having a depth less than the thickness of said rim and extending over a circumferential arc of less than 180° and an electrically insulating plug formed to fit said cut-out portion, said plug containing at least one aperture for receiving one of said tube pins, said one aperture having a diameter at least as large as the diameter of said nubbin. 
     
     
       2. The base of claim 1 wherein said plug is formed from silicone rubber.